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You can add 2 or 3 peeled large potatoes, let it cook for about 1/2 hour, then remove and taste your soup. This should absorb a lot of the spice. You can also add additional diced potatoes, beans and tomatoes (or course, plain, with no added spice, if you're using canned). You can also water it down and/or make another batch without the spice packet and mix the two together.
Dairy products help to diminish the spice, so you can add some mik, plain yogurt or sour cream to the soup, but if you don't want to change the consistency or taste/color of it, after trying to decrease the spice with the potato, you can serve it with a dollop of yogurt of sour cream. Also, lemon peel is said to help eliminate spice (remove before service), as does honey or sugar, but taste so it's not too sweet.
I hope you are able to save your soup!
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